My daily commute takes my trough the mountains and after coasting down the mountain for about 5 miles my cars smokes very bad once I hit the gas again. It's a large and embarrassing plume of smoke out the tailpipe that continues until I reach cruising speed of about 65 mph. I smell oil when it does it. Sometimes when I step on the gas hard I can see a little smoke even if I haven't been coasting down hill. Compression ranges from 139-148. No coolant in oil or visa versa. The car burns oil, about 1 qt every 500-700 miles. Is my compression low enough for it to be worn rings or its it something else? I would guess the engine has at least 200,000 miles on it.